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A233126
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Number of nX5 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabelled 6-colorings with no clashing color pairs)
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1
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36, 10496, 3497984, 1189609472, 406142844928, 138791062863872, 47441169369530368, 16217390240149536768, 5543904365985920974848, 1895191786824003443752960, 647875237241500909514522624
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 544*a(n-1) -82944*a(n-2) +5144576*a(n-3) -146800640*a(n-4) +1879048192*a(n-5) -8589934592*a(n-6)
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EXAMPLE
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Some solutions for n=2
..0..1..0..2..5....0..1..0..2..5....0..1..0..2..0....0..1..2..1..2
..1..0..4..5..2....1..0..2..5..2....2..5..1..0..1....4..2..4..3..4
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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